package com.atguigu.mapreduce.combiner;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

import java.io.IOException;

/**
 * KEYIN,map阶段输入的key的类型，LongWritable
 * VALUEIN,map阶段输入的value类型，Text
 * KEYOUT,map阶段输出的key类型，Text
 * VALUEOUT,map阶段输出的value类型，IntWriteable
 * */
public class WordCountMapper extends Mapper<LongWritable, Text,Text, IntWritable> {
    private Text outK = new Text();
    private IntWritable outV = new IntWritable(1);
    @Override
    protected void map(LongWritable key, Text value, Mapper<LongWritable, Text, Text, IntWritable>.Context context) throws IOException, InterruptedException {
        // 获取一行
        String line = value.toString();
        // 切割-用空格分割
        String[] words = line.split(" ");

        // 循环写出
        for (String word : words) {

            outK.set(word);

            context.write(outK,outV);
        }
    }
}
